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' UNITED A S N OFFICE nfrrNfNiaeAnANn .whonupriaorhnti roR NYY,

PRESSURE-GAGE.

3 1 specificatio of; Letters Patent Nassau, ldated Ju iie t, 1861.

To all whom itmwy con cern. M l

Be itknownwthat we,.R.[FINNEeAN and A. F. SGHULTE, of the city, county,and

State of New York, have invented certain new, and useful Improvements inPressure- Gages; and we do hereby declarethat the following is ajfull,ClG21I,\ and exact description of the same, reference being hadtothe accompanying drawings, forming part of this I specification, inwhich I Figure 1, 1s a. front view of the working parts of a gage withour improvements. Fig. 2, is a section of the same in the planeindicated by the red line in Fig.1.

Similar letters ofreiierence indicatecor: res onding parts in bothfigures.

. ur invention relates to that; olassof pressure gages in which thepressure of the steam or other fluid is received on a flexible plate.

It consists in the combination for the pur pose of transmittingithemovements of the plate to. the index of a lever andga screwed orspirally grooved spindle applied as hereinafter specified. Y p Q h Italso consists in a certainmode of providing for the movement of theleverto ad'- just or correct the ga e.

To enable others skilled iIlQlZlIG art to make and use our invention wewill proceed to describe its construction and operation. I

A, represents aportion of the back of the box or case of the gage towhich the flexible plate B, isseoured by a ring G, and screws 1 a a. l VI D, isa straight slotted bar, placed across the front of the ringC, andsecured firmly thereto by screws 6, Z2.

E, is a block fitted to the $101; 0, of the bar D, and having pivotedtoit by a fulcrum pin (Z, the lever F, which extends across the centerof the plate B, and bears against a small stud e, secured to thecenterof the said plate.

G, is a socket secured to the barD, and standing at right anglesthereto, and to the plateB, and constituting the bearingfor the spindleH, of the index 9. This spindle has in it a spiral groove 7", whichreceives the point of a screw or pin h, inserted through one side of thesocket G. The efiect of this pin it, .is to cause the spindle to receivea rotary motion hythe application of pressure in an endwise direction,and to receive 1 contact with the flexible plate, as it h and keep itsrear end-always in contact with the lever F. When the pressure on theback and front of the plate B, is uniform, the spring 2', by its actionon the. spindle H,

= keeps the index at the zero point on the 5 scaleof the gage, which isnot represented in the drawing, but when the pressure on I l the backexceeds more or less that in front, I

the plate B, is pressedforward more or less I and by theconsequentpresjsure of the stud 0 against the lever, the leveris madetopress against thespindle H, and so to turn l the said spindle and theindex and the latter indicates the degree of excess of pressure upon thescale of the gage. By .the combinationofthe spirally grooved spindleI-I, and lever F, a greater movement of i. the index is obtained with agiven movement of the flexible plate than canfbe obtained f thespirallygrooved spindle is in immedl some gages, and the said spindle consti amore simplemode of combining with the index than is employedin gages inwhich, the flexible plateacts tip the index through the medium of alever;

I, is a screw arranged parallel with th bar D, and screwing through theblock This screw has its shank fitted toturnli fixed bearing is,attached to or formed up the bar D, and provided with shoulders whichprevent its moving longitudinally in the said bearing. By turning thesaid screw by a key applied to a square Z, on its outer I end it is madeto move the block E, in the 3 slot 0, of the bar D, and so to vary thedistan'ce between the fulcrum I (Z, of thee lever F,

and the stud e, and hence to make the fiexure of the plate B, act withgreater or less efi'ect upon the index. Thesaid screw I, thusconstitutes a means of adjustment or correction of the gage. In order tofacilitate the accurate adjustment or correction, the spindle of thesaid screw I, has formed upon it a worm Z, which gears with a wheel m,on a spindle n, which works in a fixed bearing carried by the bar D, andon this spindle there is an index p, to indicate on a fixed scale (notshown) the amount of movement given to the screw.

The gage constructed as herein specified crum of the lever F, and thescrew I, applied is applicable for steam, hydrostatic or any incombination With the slotted bar D, or

. other fluid pressure, or for Vacuum. its equivalent and operatingsubstantially as What We claim as our invention, and deherein specifiedfor the adjustment or cor- 15 5 sue to secure lloy Letter; Patent;isrection of the gage. 1. The emp oyment or transmitting the v movementsof the flexible plate B, to the V K Q index 9, of a lever F, andspirally grooved spindle H, combined and applied substan- Witnesses: 10tially as herein specified. LEWIS A. TUCKER, 2. The movable blockE,"carrying the ful- M. M. LIVINGSTON.

